Upon his return to the NBA, he wore #45 (his brother's number again) because of some strange rule (I never got the full lowdown on that). Either that or he was trying to just get more jerseys sold. However, in the second season of his return, he went back to wearing #23.

Upon his second retirement, there was some talk of retiring the number league-wide like the NHL did for Wayne Gretzky's #99. However, there were too many players wearing it, most in tribute to Jordan, so he asked that they not do it.